Means for preventing acidity in oils



Patented June 28, 1927.

UNITED STATES PATENT QFFICE.

CLARENCE J. BODKAN, OI WILKINSBURG, EEI VNSYLV'ANIA, 581G103 1'0 HOUSE ELECTRIC 6; MANUFACTURING COMPANY, A CORPORATION 2mm VANIA. l i

MEANS FOR PREVENTING ACIDITY IN OILS.

Ho Drawing. Application flle'd Karen 12, 1925. Serial K0. 15,169.

My invention relates to oil-filled electrical translating devices and especially to means for preventing the deterioration and oxidation of the oil therein.

It is among the objects of my invention to provide means for preventing the formation of acids in the oil of electrical translating devices thereby prolonging the life of usefulness of the insulation therein and of the oil.

Herctofore, the metal parts of' electrical translating devices such as transformers, circuit breakers and the like have either been left bare or-in some instances, merely covered with a material that provides electrical insulation. The copper or cuprous' metal parts have been allowed to remain in contact with the oil as no harmful reaction between the metal and the oil in the presence of oxygen was known to have existed. It is known that copper acts as a carrier for oxygen and causes the oil to be broken down into organic acids, estersand other undersirablereaction products such as gums, tar, carbon and other sludge constituents.

My invention consists. in providing the translating devices with a coating of another metal on the parts that'arein contact with the oil. The metal used for coating the c0pper is such a metalas does not function as" a carrier for combinin with the oil or a meta that is less energetic x coating comprising a metal whi'c than copper as a carrier of 0 gen.

I provide the metal parts of oil-filled translating devices with a coating of tin or with any "metal which'does not act as a carrier foroxygen. I have found that tin and zinc not less energetically toward the oilv than do iron or copper. Copper acts'most energetically as an oxy en carrier and when the copper is coated wit the less active oxygen-carrying or non-catalytic metal, the formation of sludge and acid constituents is inhibited and the insulation properties of the oil as well as the other insulating materials are preserved.

For example, I coat all the copper parts of the device, which come in contact with the oil, preferably with tin. Insulation on the dissolved oxygen ung cuprous metal submerged a coating of tin on said metal.

some pr the copper parts will rotect thecopper and in such cases only t e exposed parts are coated. As the tin does not act catalytically to form organic acids and sludges in the customary oxidation process,

tin alone as an. oxidizing inhibitingmaterinl,

as zinc is an efiicient coating material and may be utilized in my invention. Other modifications of myinvention will an themselves to those skilled in the'art wit out departing from the irit of my invention the scope of which is defined in the annexed claims.

I claim as my invention: 1. 'In combination with an electrical translating device containing oil, said device haw mg a cuprous metal submerged in said oil, of a coating of another metal on said onprous metal said coating comprisin a' metal pica inhibits the foirmation of aci s in said 01 2. In combination with an electrical trans:

lating device containing oil, said device havanother metal on saideo ring cofpper submerged in said oil, of a. coatlng'o p r "said inhibits the formation of acids in said oil.

3. In combination with an electrical translating device containing oil, said device having 0 another metal on said copper,- said is'inert'toward said oil as an oxygen carrier.

4. In combination with an electrical translating device containing oil, said device havin said oil, of

In testimony whereof, I have hereunto subscribed my name this 28th day of February, 1925.

'emnnncn J. Rooms.

ing" 0 per submerged in said oil, of a coat-- 

